S23-281 Selective Organ and Cell-type in vivo Delivery of RNA Using GSer-CARTs Stanford scientists have discovered that Guanidinylated Serinol Charge-altering Releasable Transporters (GSer-CARTs) can be tuned for selective mRNA delivery to the lung and spleen in a predictable fashion. Zhijian Li Laura Amaya Paul Wender Robert Waymouth Howard Chang Aloysius Ee